A single cell and a battery pack

Abstract

This application provides a single-cell battery and a battery pack, including a housing with an open receiving cavity; an electrode assembly disposed in the receiving cavity, the electrode assembly including tabs; and a cover plate assembly including a cover plate, a terminal post, and a connecting piece. The cover plate closes to the opening of the receiving cavity. The terminal post includes a terminal post body and a terminal post base. The terminal post body passes through the cover plate, the terminal post base is disposed on the side of the terminal post body near the electrode assembly, and the connecting piece is disposed on the side of the terminal post base away from the terminal post body. The connecting piece has a connecting surface that connects to the tabs. The connecting piece and the terminal post base are an integral structure. The terminal post base has a mounting surface, and the mounting surface and the connecting surface are set at an angle θ, satisfying: 0° < θ < 180°. Since the connecting piece and the terminal post base are an integral structure, welding is not required, which not only avoids the melting of plastic parts and improves the safety performance of the single-cell battery, but also simplifies the assembly steps and improves the assembly efficiency of the single-cell battery.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a single cell battery and a battery pack. Background Technology

[0002] A single battery cell is the basic unit of a power battery, which typically includes an electrode assembly and a cover assembly. The electrode assembly includes tabs, and the cover assembly includes a cover plate, terminals, and connecting tabs. The terminals pass through the cover plate, and the connecting tabs are welded to the terminals and tabs respectively, thereby realizing the charging and discharging of the battery.

[0003] In related technologies, a plastic component is usually placed between the terminal and the cover plate, mainly serving the functions of insulation and sealing. However, during the welding process between the connecting piece and the terminal, the heat generated during welding can be conducted from the terminal to the plastic component, causing the plastic component to melt and thus affecting the safety performance of the individual battery cell. Utility Model Content

[0004] This application aims to provide a single-cell battery and a battery pack to solve the problem that the welding of connecting pieces and terminals causes the plastic parts to melt, thereby affecting the safety performance of the single-cell battery.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, this application discloses a single-cell battery, comprising:

[0007] A housing having an opening for receiving cavity;

[0008] An electrode assembly disposed in the receiving cavity, the electrode assembly including tabs;

[0009] The cover plate assembly includes a cover plate, an electrode post, and a connecting piece. The cover plate covers the opening of the receiving cavity. The electrode post includes an electrode post body and an electrode post base. The electrode post body passes through the cover plate. The electrode post base is located on the side of the electrode post body near the electrode assembly. The connecting piece is located on the side of the electrode post base away from the electrode post body. The connecting piece has a connecting surface that is connected to the electrode tab.

[0010] The connecting piece and the pole base are an integral structure. The pole base has a mounting surface that is opposite to the pole body. The mounting surface and the connecting surface are set at an angle θ, satisfying: 0°<θ<180°.

[0011] Optionally, the connecting piece is fixedly connected to the pole base.

[0012] Optionally, the angle θ between the mounting surface and the connecting surface is 90°.

[0013] Optionally, the connecting piece is rotatably connected to the pole base.

[0014] Optionally, the connecting piece is provided with a connecting shaft;

[0015] The pole base is provided with an open elastic sleeve, which is sleeved on the connecting shaft.

[0016] The connecting shaft is rotatably connected to the elastic sleeve, and the elastic sleeve is used to apply a radial clamping force to the connecting shaft.

[0017] Optionally, the connecting piece has a mounting groove on one side near the pole base, the connecting shaft is disposed in the mounting groove, and the end of the connecting shaft is fixedly connected to the groove wall of the mounting groove.

[0018] Optionally, at least a portion of the mounting surface is recessed toward the pole body to form a receiving groove, the receiving groove being used to receive at least a portion of the connecting piece and the tab.

[0019] Optionally, the connecting piece is provided with at least one, each connecting piece having two oppositely disposed connecting surfaces, at least one of the two connecting surfaces being connected to the tab.

[0020] Optionally, the width direction of the cover plate is the first direction, and two connecting pieces are provided. The two connecting pieces are provided on opposite sides of the pole base along the first direction, and the connecting surface near the center of the pole base is connected to the pole tab.

[0021] Secondly, this application also discloses a battery pack, including the aforementioned single battery cell.

[0022] In this embodiment, since the connecting piece and the terminal base are an integral structure, welding is not required during the assembly of the individual battery. This not only effectively avoids the melting of plastic parts caused by heat conduction during welding, thus improving the safety performance of the individual battery, but also simplifies the assembly process, thereby increasing the assembly efficiency of the individual battery. Furthermore, since the connecting surface of the connecting piece and the mounting surface of the terminal base are set at an angle θ, satisfying 0° < θ < 180°, changing the angle between them can adapt to different electrode connection scenarios, thereby improving the ease of connection between the electrode and the connecting piece.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is one of the structural schematic diagrams of a single battery provided in the embodiments of this application;

[0026] Figure 2 This is a second schematic diagram of the structure of a single battery provided in the embodiments of this application;

[0027] Figure 3 This is the third schematic diagram of a single-cell battery provided in the embodiments of this application;

[0028] Figure 4 yes Figure 2 AA section view;

[0029] Figure 5 This is a schematic diagram of the structure of a pole post base and a connecting piece provided in an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of another pole post base and connecting piece provided in an embodiment of this application;

[0031] Figure 7 This is one of the structural schematic diagrams of another pole post base and connecting piece provided in the embodiments of this application;

[0032] Figure 8 This is a second schematic diagram of another type of pole post base and connecting piece provided in the embodiments of this application;

[0033] Figure 9 This is the third structural schematic diagram of another pole post base and connecting piece provided in the embodiments of this application;

[0034] Figure 10 yes Figure 9 A magnified view of a portion of position A in the middle.

[0035] Figure label:

[0036] 100. Single cell battery

[0037] 1. Housing; 11. Receiving cavity; 12. Explosion-proof valve.

[0038] 2. Electrode assembly, 21. Tab, 22. Electrode plate,

[0039] 3. Cover plate assembly, 31. Cover plate, 311. Terminal hole, 32. Terminal, 321. Terminal body, 322. Terminal base, 3221. Elastic sleeve, 3222. Receiving groove, 3223. Mounting surface, 33. Connecting piece, 331. Connecting shaft, 332. Mounting groove, 333. Connecting surface, 34. Plastic part, 341. First plastic part, 342. Second plastic part,

[0040] X. First direction, Y. Second direction, Z. Third direction. Detailed Implementation

[0041] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0042] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0043] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] This application provides a single-cell battery, which will be described in detail below with reference to the accompanying drawings.

[0046] Reference Figures 1 to 3 This shows a schematic diagram of the structure of a single battery provided in an embodiment of this application. (Refer to...) Figure 4 , showed Figure 2 AA section view, refer to Figure 5 This diagram illustrates a structural schematic of a pole post base and connecting piece provided in an embodiment of this application. (Refer to...) Figure 6 This shows a schematic diagram of another pole post base and connecting piece provided in an embodiment of this application. (Refer to...) Figures 7 to 9 This shows a schematic diagram of another type of pole post base and connecting piece provided in an embodiment of this application. (Refer to...) Figure 10 , showed Figure 9 A magnified view of a portion of position A in the middle.

[0047] like Figures 1 to 4 As shown, this application provides a single-cell battery 100, including: a housing 1, the housing 1 having an opening in a receiving cavity 11; an electrode assembly 2, the electrode assembly 2 being disposed in the receiving cavity 11, the electrode assembly 2 including tabs 21; and a cover plate assembly 3, the cover plate assembly 3 including a cover plate 31, a terminal post 32, and a connecting piece 33, the cover plate 31 covering the opening of the receiving cavity 11, the terminal post 32 including a terminal post body 321 and a terminal post base 322, the terminal post body 321 passing through the cover plate 31, and the terminal post base 322... A tab 22 is disposed on the side of the electrode body 321 near the electrode assembly 2, and a connecting piece 33 is disposed on the side of the electrode base 322 opposite to the electrode body 321. The connecting piece 33 has a connecting surface 333, which is connected to the tab 21. The connecting piece 33 and the electrode base 322 are integrally formed. The electrode base 322 has a mounting surface 3223 opposite to the electrode body 321, and the mounting surface 3223 and the connecting surface 333 are set at an angle θ, satisfying: 0°<θ<180°. Specifically, the cover plate 31 is provided with an electrode hole 311, through which the electrode body 321 passes.

[0048] In this embodiment, since the connecting piece 33 and the terminal base 322 are an integral structure, welding is not required between the connecting piece 33 and the terminal base 322 during the assembly of the single battery 100. This not only effectively avoids the melting of the plastic part 34 due to heat conduction during welding, thereby improving the safety performance of the single battery 100, but also simplifies the assembly process, thereby improving the assembly efficiency of the single battery 100. Furthermore, since the connecting surface 333 of the connecting piece 33 and the mounting surface 3223 of the terminal base 322 are set at an angle θ, satisfying 0° < θ < 180°, the angle between the two can be changed to adapt to different connection scenarios of the tab 21, thereby improving the ease of connection between the tab 21 and the connecting piece 33.

[0049] It should be noted that the single-cell battery 100 in this application embodiment includes, but is not limited to, prismatic batteries, cylindrical batteries, and pouch batteries, etc., and is not limited thereto. Those skilled in the art can make adjustments according to actual needs. Taking a prismatic battery as an example, the first direction X in the figure is the width direction of the cover plate 31, that is, the width direction of the shell 1; the second direction Y is the length direction of the cover plate 31, that is, the length direction of the shell 1; and the third direction Z is the thickness direction of the cover plate 31, that is, the height direction of the shell 1. Among them, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0050] Furthermore, in this application embodiment, "integrated structure" refers to the connection piece 33 and the terminal base 322 being assembled as a single unit with other components (such as the tab 21 and the cover plate 31). Specifically, the integrated structure can be a single integrally formed structural component or multiple pre-assembled structural components; no limitation is made here, and those skilled in the art can choose according to actual needs. Additionally, in this application embodiment, "the connection piece 33 and the terminal base 322 are set at an angle" means that after the single battery 100 is assembled, that is, the final state of the connection piece 33 and the terminal base 322 is set at an angle. This application embodiment does not limit the specific value of the angle between the connection piece 33 and the terminal base 322; those skilled in the art can adjust it according to actual needs. Furthermore, the terminal body 321 and the terminal base 322 of the terminal 32 can be an integrally formed structure, thereby improving the overall structural strength of the terminal 32.

[0051] In practical applications, electrode assembly 2 is a key functional unit for battery energy storage and release. Electrode assembly 2 includes electrode plate 22 and tab 21. Electrode plate 22 consists of an active material layer and a current collector, responsible for inserting / extracting lithium ions during charging and discharging, realizing the conversion of electrical energy into chemical energy. Tab 21 is a metallic conductor extending from the end of electrode plate 22, serving as a bridge connecting the positive and negative electrodes of the battery to the external circuit, responsible for the introduction and extraction of current.

[0052] Furthermore, the terminal 32 includes a positive terminal 32 and a negative terminal 32, and the tab 21 includes a positive tab 21 and a negative tab 21. The positive tab 21 is connected to the positive terminal 32 via a connecting piece 33, and the negative tab 21 is connected to the negative terminal 32 via a connecting piece 33. It is understood that the positive terminal 32 and the negative terminal 32 have the same structure and will not be distinguished further below. Furthermore, the positive tab 21 and the connecting piece 33, as well as the negative tab 21 and the connecting piece 33, can be connected using ultrasonic welding.

[0053] In specific applications, the single-cell battery 100 also includes a plastic component 34, which comprises a first plastic component 341 and a second plastic component 342. The first plastic component 341 is disposed between the terminal body 321 and the terminal hole 311, and the second plastic component 342 is disposed between the terminal base 322 and the cover plate 31. This not only achieves reliable insulation between the cover plate 31 and the terminal 32, but also prevents electrolyte leakage, thereby improving the safety performance of the single-cell battery 100. Furthermore, the single-cell battery 100 also includes an explosion-proof valve 12, which is disposed on the housing 1. The explosion-proof valve 12 is used to open and release pressure in the event of an abnormal increase in internal pressure of the housing 1, thereby preventing the battery from exploding due to overpressure or overheating during charging, discharging, or abnormal operating conditions. In one embodiment, the housing 1 includes a bottom wall perpendicular to the third direction Z, and the explosion-proof valve 12 can be disposed on the bottom wall.

[0054] It should be noted that the shape of the connecting piece 33 in this application embodiment includes, but is not limited to, rectangles, semicircles, polygons, or other shapes, and is not limited here. Those skilled in the art can adjust it according to actual needs. It is understood that when the connecting piece 33 is rectangular, due to its simple structure and large area, it not only simplifies the structure of the connecting piece 33 but also improves the connection reliability between the connecting piece 33 and the electrode tab 21. Furthermore, to improve assembly safety, the four corners of the connecting piece 22 can be rounded. Further, this application embodiment does not limit the size of the connecting piece 33, and those skilled in the art can adjust it according to actual needs. In one embodiment, the connecting piece 33 extends along the second direction Y, and the length of the connecting piece 33 in the second direction Y can be less than or equal to the length of the electrode base 322 in the second direction Y. This not only reduces the space occupied inside the housing 1 but also improves the structural strength of the connecting piece 33, while also avoiding scratches during assembly. Furthermore, the length of the connecting piece 33 in the second direction Y can be greater than or equal to the length of the electrode tab 21 in the second direction Y, thus improving the connection reliability between the connecting piece 33 and the electrode tab 21.

[0055] In some alternative embodiments of this application, such as Figure 4As shown, the connecting piece 33 is fixedly connected to the pole base 322. It should be noted that the embodiments of this application do not limit the fixed connection method between the connecting piece 33 and the pole base 322. In one embodiment, the connecting piece 33 and the pole base 322 can be processed by an integral molding process to reliably fix the connecting piece 33 and the pole base 322.

[0056] In this embodiment, since the connecting piece 33 is fixedly connected to the terminal base 322, the overall structural strength of the terminal base 322 and the connecting piece 33 can be improved. Furthermore, when the connecting piece 33 and the terminal base 322 are processed using an integral molding process, the assembly steps of the connecting piece 33 and the terminal base 322 can be saved, further simplifying the assembly process and improving the assembly efficiency of the single cell 100.

[0057] It should be noted that the connecting piece 33 and the pole base 322 can be processed by stamping, casting or other integral molding processes, which are not limited here. Those skilled in the art can adjust them according to actual needs. In addition, a gap should be maintained between the connecting piece 33 and the core formed by the pole piece 22, so as to avoid the connecting piece 33 damaging the core. The size of the gap between the connecting piece 33 and the core is not limited in this embodiment.

[0058] In some alternative embodiments of this application, such as Figures 4 to 6 As shown, the angle θ between the mounting surface 3223 and the connecting surface 333 is 90°, that is, the mounting surface 3223 and the connecting surface 333 are perpendicular to each other.

[0059] In this embodiment, by perpendicularly aligning the connecting surface 333 of the connecting piece 33 with the mounting surface 3223 of the pole base 322, the difficulty of integral forming processes such as stamping or casting can be reduced, which is beneficial for improving production efficiency and reducing production costs. Furthermore, the connecting piece 33 is typically a sheet-like structure with two parallel connecting surfaces 333, meaning both connecting surfaces 333 are perpendicular to the mounting surface 3223. This reduces the difficulty of simultaneously connecting the two connecting surfaces 333 to the pole tab 21, further improving production efficiency and reducing production costs. Moreover, by perpendicularly aligning the connecting surface 333 of the connecting piece 33 with the mounting surface 3223 of the pole base 322, the distance between the connecting piece 33 and the length direction of the housing 1 (i.e.,...) can be reduced. Figure 4 (as shown in the front-to-back direction) and width direction (i.e.) Figure 4 The space occupied in the left and right directions (as shown) can be optimized to improve the layout inside the housing 1 and achieve a compact design of the single battery 100.

[0060] In some alternative embodiments of this application, such as Figures 7 to 9As shown, the connecting piece 33 is rotatably connected to the pole base 322. That is, the connecting piece 33 can rotate freely relative to the pole base 322. In this way, during the assembly process, the connecting piece 33 can be rotated to the optimal position for welding the tab 21, thereby better adapting to different tab 21 connection scenarios and improving the ease of connection between the tab 21 and the connecting piece 33.

[0061] During the assembly of the single cell 100, workers typically first assemble the terminal post 32 with the cover plate 31, then weld the tab 21 with the connecting piece 33, and finally install the electrode assembly 2 and the cover plate 31 onto the housing 1. During the welding of the tab 21, the cover plate 31 is usually placed flat on the worktable. At this time, the connecting piece 33 can be rotated to a position approximately parallel to the worktable (i.e., the angle between the connecting piece 33 and the terminal post base 322 is 180°), so that the worktable can provide support for the connecting piece 33 and the tab 21, facilitating better welding and improving the convenience and reliability of the welding process.

[0062] In some alternative embodiments of this application, such as Figure 10 As shown, the connecting piece 33 is provided with a connecting shaft 331; the pole base 322 is provided with an elastic sleeve 3221 with an opening, and the elastic sleeve 3221 is sleeved on the connecting shaft 331. Here, the elastic sleeve 3221 refers to a sleeve structure that can undergo elastic deformation under the action of external force. Through the elastic deformation of the elastic sleeve 3221, a radial clamping force can be applied to the connecting shaft 331.

[0063] In this embodiment, an elastic sleeve 3221 with an opening is provided and is sleeved on the connecting shaft 331. Thus, when an external force is applied to the connecting piece 33, the elastic sleeve 3221 undergoes elastic deformation, allowing the connecting piece 33 to rotate relative to the elastic sleeve 3221 to a suitable position. When the external force is stopped, the elastic sleeve 3221 returns to its original position and applies a radial clamping force to the connecting shaft 331, thereby keeping the connecting piece 33 in a suitable position. This improves the ease and reliability of welding the electrode tab 21.

[0064] In some alternative embodiments of this application, such as Figure 7 As shown, the connecting piece 33 has a mounting groove 332 on one side near the pole base 322, and the connecting shaft 331 is disposed in the mounting groove 332. The end of the connecting shaft 331 is fixedly connected to the groove wall of the mounting groove 332.

[0065] In this embodiment, since the mounting groove 332 is provided, the connecting shaft 331 can be placed in the mounting groove 332 to achieve a hidden setting, thereby reducing the overall size of the pole base 322 and the connecting piece 33, reducing the occupation of the internal space of the battery, and thus increasing the exhaust space, which is beneficial to improving the safety performance of the single battery 100.

[0066] In some alternative embodiments of this application, at least a portion of the mounting surface 3223 is recessed toward the pole body 321 to form a receiving groove 3222, which is used to receive at least a portion of the connecting piece 33 and the tab 21.

[0067] In this embodiment, the receiving groove 3222 is provided. During transportation, the receiving groove 3222 can accommodate the connecting piece 33, which not only facilitates the transportation of the integrated structure of the electrode base 322 and the connecting piece 33, but also reduces the problem of the connecting piece 33 being scratched, thus improving the yield of the integrated structure. During the assembly of the single cell 100, the welded tab 21 and the connecting piece 33 can be rotated toward the receiving groove 3222. The receiving groove 3222 can avoid the tab 21 and the connecting piece 33, so that the tab 22 and the connecting piece 33 are as close as possible to the electrode base 322. This reduces the space occupied by the connecting piece 33 and the tab 21 inside the battery, thereby increasing the venting space and improving the safety performance of the single cell 100.

[0068] It should be noted that the depth of the receiving groove 3222 is not limited in this embodiment, and those skilled in the art can adjust it according to actual needs. In one embodiment, the depth of the receiving groove 3222 can be greater than or equal to the thickness of the connecting piece 33, thereby better accommodating the connecting piece 33 and further reducing the problem of the connecting piece 33 rubbing against the wall. It is understood that due to the presence of the tab 21, the connecting piece 33 is difficult to completely fit with the terminal base 322, that is, after the single cell 100 is assembled, there is a certain angle between the connecting piece 33 and the terminal base 322.

[0069] In some alternative embodiments of this application, such as Figures 5 to 9 As shown, at least one connecting piece 33 is provided, and each connecting piece 33 has two parallel connecting surfaces 333, at least one of which is connected to the tab 21. In this way, the tab 21 can be connected to the connecting surface 333 from different directions, thereby improving the assembly flexibility of the tab 21 and the connecting piece 33.

[0070] It should be noted that the number of connecting pieces 33 is not limited in this application embodiment, and those skilled in the art can adjust it according to actual needs. In one embodiment, such as Figure 5As shown, a connecting piece 33 is provided, positioned in the middle of the pole base 322, so that there is sufficient installation space between both sides of the connecting piece 33 and the housing 1, allowing the pole tabs 21 to be connected to both connecting surfaces 333 simultaneously. In another embodiment, as... Figures 6 to 9 As shown, there are two connecting pieces 33, which are respectively located at two opposite edges of the pole base 322, so that there is enough installation space between the two connecting pieces 33, so that the tab 21 can be connected to the connecting surface 333 near the center of the pole base 322.

[0071] In some alternative embodiments of this application, such as Figures 6 to 9 As shown, the width direction of the cover plate 31 is the first direction X. Two connecting pieces 33 are provided, which are located on opposite sides of the pole base 322 along the first direction X. The connecting surface 333 near the center of the pole base 322 is connected to the tab 21. Specifically, the housing 1 includes a first sidewall that is arranged opposite to each other along the first direction X. The first sidewall is the wall with the largest area of ​​the housing 1, and the connecting pieces 33 are arranged parallel to the first sidewall.

[0072] Generally, due to the stacking arrangement of the electrode plates 22, the electrode tabs 21 are usually parallel to the first sidewall. Therefore, by placing the connecting piece 33 on opposite sides of the electrode base 322 along the first direction X, the connecting piece 33 and the electrode tabs 21 can be made approximately parallel, facilitating welding between them. Furthermore, since the width of the housing 1 is relatively small, the installation space between the connecting piece 33 and the first sidewall is also small. By connecting the connecting surface 333 of the connecting piece 33 near the center of the electrode base 322 to the electrode tabs 21, assembly difficulty can be reduced and assembly efficiency improved.

[0073] In summary, the single-cell battery provided in this application embodiment has at least the following advantages:

[0074] In this embodiment, since the connecting piece and the terminal base are an integral structure, welding is not required during the assembly of the individual battery. This not only effectively avoids the melting of plastic parts caused by heat conduction during welding, thus improving the safety performance of the individual battery, but also simplifies the assembly steps, thereby increasing the assembly efficiency of the individual battery. Furthermore, since the connecting surface of the connecting piece and the mounting surface of the terminal base are set at an angle θ, satisfying 0° < θ < 180°, changing the angle between the two can adapt to different electrode connection scenarios, thereby improving the ease of connection between the electrode and the connecting piece.

[0075] This application also provides a battery pack, including the aforementioned single battery cell 100.

[0076] In this embodiment, by setting the connecting piece 33 and the terminal base 322 as an integral structure, not only can the melting phenomenon be avoided, but the assembly steps can also be simplified, thereby improving the safety performance and assembly efficiency of the single cell 100, and further improving the overall safety performance and production efficiency of the battery pack.

[0077] It should be noted that in this embodiment, the structure of the single battery 100 is the same as that of the single battery 100 in any of the above embodiments, and its beneficial effects are similar, so it will not be described again here. The battery pack of this embodiment can be applied to vehicles, ferries, computers, aircraft, energy storage devices or other equipment, and is not limited thereto. Those skilled in the art can make adjustments according to actual needs.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A single-cell battery, characterized in that, include: A housing having an opening for receiving cavity; An electrode assembly disposed in the receiving cavity, the electrode assembly including tabs; The cover plate assembly includes a cover plate, an electrode post, and a connecting piece. The cover plate covers the opening of the receiving cavity. The electrode post includes an electrode post body and an electrode post base. The electrode post body passes through the cover plate. The electrode post base is located on the side of the electrode post body near the electrode assembly. The connecting piece is located on the side of the electrode post base away from the electrode post body. The connecting piece has a connecting surface that is connected to the electrode tab. The connecting piece and the pole base are an integral structure. The pole base has a mounting surface that is opposite to the pole body. The mounting surface and the connecting surface are set at an angle θ, satisfying: 0° < θ < 180°.

2. The single-cell battery according to claim 1, characterized in that, The connecting piece is fixedly connected to the pole base.

3. The single-cell battery according to claim 1, characterized in that, The angle θ between the mounting surface and the connecting surface is 90°.

4. The single-cell battery according to claim 1, characterized in that, The connecting piece is rotatably connected to the pole base.

5. The single-cell battery according to claim 4, characterized in that, The connecting piece is provided with a connecting shaft; The pole base is provided with an open elastic sleeve, which is sleeved on the connecting shaft.

6. The single-cell battery according to claim 5, characterized in that, The connecting piece has a mounting groove on one side near the pole base, the connecting shaft is disposed in the mounting groove, and the end of the connecting shaft is fixedly connected to the groove wall of the mounting groove.

7. The single-cell battery according to claim 4, characterized in that, At least a portion of the mounting surface is recessed toward the pole body to form a receiving groove, the receiving groove being used to receive at least a portion of the connecting piece and the tab.

8. The single-cell battery according to any one of claims 1-7, characterized in that, The connecting piece is provided with at least one, and each connecting piece has two parallel connecting surfaces, at least one of which is connected to the tab.

9. The single-cell battery according to claim 8, characterized in that, The width direction of the cover plate is the first direction. There are two connecting pieces. The two connecting pieces are located on opposite sides of the pole base along the first direction, and the connecting surface near the center of the pole base is connected to the pole tab.

10. A battery pack, characterized in that, Includes the single-cell battery as described in any one of claims 1-9.

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